SPECIAL FEATURE OF USING OF T-SHAPED INDUCTION MOTOR EQUIVALENT CIRCUIT FOR PROBLEMS OF PARAMETERS IDENTIFICATION

Special feature of using of T-shaped equivalent circuit for induction motor parameters identification is considered. It is shown that starting with a certain power frequency, input impedance of a braked induction motor is determined by the equivalent input resistance and the equivalent input inductance. Impossibility of all parameters identification of the given induction motor equivalent circuit using signals of current and voltage at different frequencies both for stationary and rotating motor is proved. It is proved that using this approach we can obtain no more than four independent equa-tions.